计时安培法
循环伏安法
化学
无机化学
吸附
铂金
电化学
氢
一氧化碳
可逆氢电极
金属
铂纳米粒子
催化作用
电极
工作电极
有机化学
物理化学
作者
Neha Neha,Thibault Rafaïdeen,Théo Faverge,Frédéric Maillard,Marian Chatenet,Christophe Coutanceau
出处
期刊:Electrocatalysis
[Springer Nature]
日期:2022-09-19
卷期号:14 (1): 121-130
被引量:13
标识
DOI:10.1007/s12678-022-00774-y
摘要
The electrooxidation of glucose on gold (Au) and platinum (Pt) nanoparticles (NPs) is investigated in alkaline medium by cyclic voltammetry after chronoamperometry at different potentials (+0.100 V, +0.200 V, and +0.400 V vs the reversible hydrogen electrode, RHE), in situ Fourier transform infrared spectroscopy, and differential electrochemical mass spectrometry measurements. We show that glucose can adsorb on both metallic Au and Pt surfaces at low potentials, but that the adsorbed species are different: hydrogen atoms, carbon monoxide (CO), lactones and gluconate species on Pt-NPs, and only hydrogen atoms and gluconate species on Au-NPs. On Pt-NPs, the first oxidation peak between +0.050 V vs RHE and +0.250 V vs RHE is due to glucose adsorption and hydrogen atoms oxidation into protons (H+), whereas the second electrochemical feature between +0.250 V vs RHE and +0.800 V vs RHE is due to the oxidation of glucose into lactone and gluconate and of adsorbed CO into carbon dioxide (CO2). For Au-NPs, adsorbed hydrogen atoms are not oxidized into H+ but transformed into molecular hydrogen H2, and glucose is adsorbed as gluconate species that are desorbed into gluconates for potentials higher than +0.300 V vs RHE.
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